Buggy code:
public abstract class AbstractTravelProductDAOImplTest { protected TravelProductDAO travelProductDAO ; private TravelProduct travelProduct ; private HotelItem hotelItem ; private TrafficItem trafficItem ; private ResortItem resortItem ; private TrivItem trivItem ; private Bidding bidding ; private TravelProposal travelProposal ; private TravelProduct travelProductWrongProposal ; @ Rule public ExpectedException thrown = ExpectedException . none ( ) ; @ Before public void before ( ) { } @ Test public void testCreateTravelProductWithNullProduct ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testCreateTravelProductWithDup ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testCreateTravelProduct ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testAddItemWithNull ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testAddHotelWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testAddHotel ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testAddTrafficWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testAddTraffic ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testAddResortWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testAddResort ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testAddTrivWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testAddTriv ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testSetBiddingWithNull ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testSetBiddingWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testSetBiddingTwice ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testSetBidding ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetProductWithNullProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetProductWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetProduct ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetHotelItemsWithNullProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetHotelItemsWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetHotelItems ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetTrafficItemsWithNullProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetTrafficItemsWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetTrafficItems ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetResortItemsWithNullProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetResortItemsWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetResortItems ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetBiddingWithNullProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testGetBidding ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveHotelItemWithNullProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveHotelItemWithNullItemId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveHotelItemWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveHotelItemWithBidding ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveHotelItem ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveTrafficItemWithNullProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveTrafficItemWithNullItemId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveTrafficItemWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveTrafficItemWithBidding ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveTrafficItem ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveResortItemWithNullProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveResortItemWithNullItemId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveResortItemWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveResortItemWithBidding ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveResortItem ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveTrivItemWithNullProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveTrivItemWithNullItemId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveTrivItemWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testRemoveTrivItem ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testUnsetBiddingWithNullProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testUnsetBiddingWithWrongProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testUnsetBidding ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testPublishProductWithNullProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testPublishProductWithNullProposalId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testPublishProductWithMisProposalId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testPublishProduct ( ) throws DatabaseAccessException , InvalidTravelProductException { UUID productId = travelProductDAO . createProduct ( travelProduct ) ; productId = travelProductDAO . setBidding ( productId , bidding ) ; <START_BUG> UUID productUuid = travelProductDAO . publishProduct ( travelProduct , travelProposal ) ; <END_BUG> assertNotNull ( productUuid ) ; assertEquals ( productId . toString ( ) , productUuid . toString ( ) ) ; assertNotNull ( travelProductDAO . publishProduct ( travelProduct , travelProposal ) ) ; assertEquals ( productId . toString ( ) , travelProductDAO . publishProduct ( travelProduct , travelProposal ) . toString ( ) ) ; } @ Test public void testUnpublishProductWithNullProductId ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testUnpublishNotExistedProduct ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ Test public void testUnpublishProduct ( ) throws DatabaseAccessException , InvalidTravelProductException { } @ After public void after ( ) { } }

Fix:
UUID productUuid = travelProductDAO . publishProduct ( travelProduct . getCore ( ) , travelProposal ) ;